dead-reckoning longitude

简明释义

积算经度

英英释义

例句

1.The navigator calculated the dead-reckoning longitude to estimate their current position at sea.

导航员计算了推算经度以估计他们在海上的当前位置。

2.Using dead-reckoning longitude, the captain was able to adjust the ship's course accurately.

利用推算经度，船长能够准确调整船只的航向。

3.He explained how dead-reckoning longitude works during the navigation training session.

他在导航培训课程中解释了推算经度的工作原理。

4.In the absence of GPS, sailors often rely on dead-reckoning longitude for navigation.

在没有GPS的情况下，水手们常常依赖推算经度进行导航。

5.The pilot updated the dead-reckoning longitude every hour to ensure they stayed on track.

飞行员每小时更新一次推算经度以确保保持在正确的航线上。

作文

In the world of navigation, understanding the concept of dead-reckoning longitude is crucial for sailors and aviators alike. This method has been used for centuries to determine one's position at sea or in the air without relying on celestial bodies or external landmarks. Essentially, dead-reckoning longitude involves calculating a current position based on a previously known position, taking into account factors such as speed, direction, and time traveled. This technique can be especially useful when visibility is poor or when navigating through areas where traditional navigational aids are unavailable.Historically, the term 'dead reckoning' originated from the phrase 'deduced reckoning,' which implies that navigators deduce their current location based on earlier calculations. The process begins with a known starting point, often marked by a specific latitude and longitude. From there, navigators must keep track of their course and speed over time to estimate their new position. For example, if a vessel departs from a known point and travels north at a speed of five knots for two hours, the navigator would calculate their new latitude and longitude accordingly.However, while dead-reckoning longitude can provide a reasonably accurate estimate, it is not without its challenges. One major issue is that it does not account for external factors such as currents, wind, and other environmental conditions that may affect the actual path traveled. This is particularly important in maritime navigation, where ocean currents can significantly alter a vessel's course. Therefore, while dead-reckoning longitude can serve as a useful tool, it is often supplemented with other navigational methods, such as GPS or celestial navigation, to ensure greater accuracy.In modern times, the advent of technology has transformed the way we navigate. Although traditional methods like dead-reckoning longitude are still taught and used, many navigators now rely heavily on electronic systems that provide real-time data and precise positioning. However, understanding the fundamentals of dead reckoning remains essential, particularly in situations where technology may fail or be unavailable. Navigators must be able to revert to basic principles to ensure safe passage.Moreover, the importance of dead-reckoning longitude extends beyond just maritime and aerial navigation. It serves as a reminder of the human ingenuity and determination required to explore uncharted territories. The ability to estimate one’s position accurately was vital for explorers who ventured into unknown waters, paving the way for global trade and cultural exchange. Today, even with advanced technology, the principles behind dead-reckoning longitude remind us of our connection to the past and the evolution of navigational practices.In conclusion, mastering the concept of dead-reckoning longitude is not only about understanding its technicalities but also appreciating its historical significance and practical applications. As we continue to navigate the skies and seas, this age-old method remains a testament to the skill and resourcefulness of navigators throughout history. Whether for practical use or academic interest, the study of dead-reckoning longitude enriches our understanding of navigation and the art of finding one’s way in an ever-changing world.

在导航的世界中，理解“推算经度”这一概念对水手和飞行员来说至关重要。这种方法已经被使用了几个世纪，用于在海上或空中确定自己的位置，而不依赖于天体或外部地标。基本上，“推算经度”涉及根据已知的位置计算当前位置，同时考虑速度、方向和行驶时间等因素。这项技术在能见度差或在传统导航工具不可用的区域航行时尤其有用。历史上，“推算”一词源于“推导航法”的短语，这意味着导航员根据早期的计算推导出他们的当前位置。这个过程始于一个已知的起点，通常标记为特定的纬度和经度。从那里，导航员必须跟踪他们的航向和速度，以估算他们的新位置。例如，如果一艘船从已知地点出发，朝北以每小时五节的速度航行两个小时，导航员将相应计算他们的新纬度和经度。然而，虽然“推算经度”可以提供相当准确的估计，但它并非没有挑战。一个主要问题是它不考虑外部因素，例如洋流、风和其他可能影响实际行驶路径的环境条件。这一点在海上导航中尤为重要，因为洋流会显著改变船只的航向。因此，虽然“推算经度”可以作为一个有用的工具，它通常与其他导航方法（如GPS或天文导航）结合使用，以确保更高的准确性。在现代，技术的发展改变了我们导航的方式。尽管传统方法如“推算经度”仍然被教授和使用，但许多导航员现在高度依赖电子系统，这些系统提供实时数据和精确定位。然而，理解推算的基本原理仍然至关重要，特别是在技术可能失效或不可用的情况下。导航员必须能够回归基本原则，以确保安全通行。此外，“推算经度”的重要性不仅限于海上和空中导航。它提醒我们人类的聪明才智和探索未知领域所需的决心。准确估计自己位置的能力对那些冒险进入未知水域的探险家至关重要，为全球贸易和文化交流铺平了道路。今天，即使有先进的技术，推算经度背后的原则也提醒我们与过去的联系以及导航实践的演变。总之，掌握“推算经度”的概念不仅仅是理解其技术细节，还要欣赏其历史意义和实际应用。随着我们继续在天空和海洋中航行，这种古老的方法仍然是对历史上导航员技能和机智的证明。无论是出于实用用途还是学术兴趣，研究“推算经度”都丰富了我们对导航及在不断变化的世界中找到方向的艺术的理解。